DODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domain

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dc.contributor.authorFeitosa, Eloi [UNESP]
dc.contributor.authorRosa Alves, Fernanda
dc.contributor.authorCastanheira, Elisabete M. S.
dc.contributor.authorOliveira, M. Elisabete C. D. Real
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniv Minho
dc.date.accessioned2014-05-20T14:02:33Z
dc.date.available2014-05-20T14:02:33Z
dc.date.issued2009-05-01
dc.description.abstractIn the millimolar concentration domain (typically 1 mM), dioctadecyldimethylammonium bromide and chloride (DODAX, X representing Br(-) or Cl(-) counterions) molecules assemble in water as large unilamellar vesicles. Differential-scanning calorimetry (DSC) is a suitable technique to obtain the melting temperature (T (m)) characteristic of surfactant bilayers, while fluorescence spectroscopy detects formation of surfactant aggregates, like bilayers. These two techniques were combined to investigate the assembly of DODAX molecules at micromolar concentrations, from 10 to 100 mu M. At 1 mM surfactant, T (m) a parts per thousand aEuro parts per thousand 45 A degrees C and 49 A degrees C, respectively, for DODAB and DODAC. DSC and fluorescence of Nile Red were used to show the formation of DODAX aggregates, at the surfactant concentration as low as 10 mu M, whose T (m) decreases monotonically with increasing DODAX concentration to attain the value for the ordinary vesicles. The data indicate that these aggregates are organized as bilayer-like structures.en
dc.description.affiliationIBILCE UNESP, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationSão Paulo State Univ, Dept Phys, Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUniv Estadual Campinas, Inst Quim, Campinas, SP, Brazil
dc.description.affiliationUniv Minho, Dept Phys, P-4710057 Braga, Portugal
dc.description.affiliationUnespIBILCE UNESP, Dept Phys, BR-15054000 Sao Jose do Rio Preto, SP, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Dept Phys, Sao Jose do Rio Preto, SP, Brazil
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipFundação para a Ciência e a Tecnologia (FCT)
dc.format.extent591-599
dc.identifierhttp://dx.doi.org/10.1007/s00396-009-2008-1
dc.identifier.citationColloid and Polymer Science. New York: Springer, v. 287, n. 5, p. 591-599, 2009.
dc.identifier.doi10.1007/s00396-009-2008-1
dc.identifier.issn0303-402X
dc.identifier.urihttp://hdl.handle.net/11449/22052
dc.identifier.wosWOS:000265382800011
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofColloid and Polymer Science
dc.relation.ispartofjcr1.967
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectDODABen
dc.subjectDODACen
dc.subjectDSCen
dc.subjectNile Reden
dc.subjectCationic vesicleen
dc.subjectMelting temperatureen
dc.subjectSteady-state fluorescenceen
dc.titleDODAB and DODAC bilayer-like aggregates in the micromolar surfactant concentration domainen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências Letras e Ciências Exatas, São José do Rio Pretopt

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